Pagastiella Brundin, 1949

Chamutiová, Tímea, Hamerlík, Ladislav & Bitušík, Peter, 2020, Subfossil chironomids (Diptera, Chironomidae) of lakes in the Tatra Mountains an illustrated guide, Zootaxa 4819 (2), pp. 216-264 : 253

Pagastiella Brundin ( Fig. 87 )

Small pale head capsule with slightly darker occipital margin. Antenna 5-segmented. Premandible trifid, first and third longer and pointy, middle tooth shorter and broader. Mandible very slender with 2 dorsal and 5 inner teeth; all teeth pale. Mentum arched, weakly pigmented with four median teeth and 6 pairs of lateral teeth; outer pair of median teeth very small, first lateral tooth broad and the other laterals decreasing in size. Ventromental plates broad and largely arched, anterior margin finely crenulated.

Remarks: Pagastiella differs from Nilothauma by having unusual position of setae submenti on the ventromental plates ( Fig. 87 ) and very small outer pair of median teeth, while in Nilothauma the central pair of median teeth is narrower.

The only Palaearctic species, P. orophila (Edwards, 1929) , is also known from the Tatra Mts. lakes. Subfossil remains were found rarely and in low abundances in lakes of the forest zone.

Figures

FIGURES 85–90. Lauterborniella: 85—head capsule (arrow indicates ventromental plate). Microtendipes pedellus-type: 86— head capsule. Pagastiella orophila: 87—head capsule (arrow indicates position of seta submenti). Phaenopsectra flavipes-type: 88—head capsule, A—mandible. Polypedilum nubeculosum-type: 89—head capsule (arrow indicates two inner teeth of the mandible). Polypedilum sordens-type: 90—head capsule (arrow indicates three inner teeth of the mandible).